Connecting Optical Cables; Figure 5-3 View Of The Module From Below - Siemens OLM/P11 V4.0 Operating Instructions Manual

Installation and Maintenance
5.1 Installation
5.1.2

Connecting optical cables

Figure 5-3
View of the module from below
with optical channels 2 and 3
(device with two optical channels)
Note
The laying of fiber-optic cables requires special measures. Mechanical stress such as traction,
pressure or kinking must be avoided. The cable manufacturers specify minimum bending radii for
fiber-optic cables both during installation and operation. The bending radii and the requirements
when laying cables depend largely on the cable type used and must therefore be checked up in
the instructions in the relevant data sheets. Ignoring these requirements may lead to higher
attenuation values and, in the worst case (extreme bending), to destruction of the fiber-optic cable.
30
Connect the single modules via a two-core fiber-optic cable
with BFOC/2.5 connectors.
Make sure
– that the end faces of the optical connectors are clean.
– that always one optical input : ψ and one optical output : ζ
are interconnected ("crossover connection"). The BFOC
sockets of a channel that belong together are marked on
the lower part of the front panel.
– that the optical connector is securely locked to the BFOC
socket (bayonet connector must be locked).
– that the tip of the BFOC connector is inserted completely
into the fiber-optic cable socket when using single mode
fiber-optic cables. If necessary, push the connector into
the socket using anti-kink sleeve to make reliable contact.
Make sure there is adequate strain relief for the fiber-optic
cable and keep to the minimum bending radii of the fiber-
optic cables (see note below).
Close unused BFOC sockets with the supplied protective
caps (note: An unused optical channel should be set to the
"bus without fiber-optic link monitoring" mode so that it
does not cause a broken fiber-optic cable signal). Incoming
external light can disturb the network, especially if the area
is bright. Intruding dust can destroy the optical
components.
Keep to the maximum length of the fiber-optic cables and
the possible fiber types, as shown in Table 2-1, page 4.
and in the technical specifications, section 4.1.
Test the quality of the link using the measurement socket
after installing the optical network. The values must be
within the permissible range according to section 5.6.
SIMATIC NET PROFIBUS, Optical Link Module
Operating Instructions, 07/2008, A2B00065774O, Edition V1.5